Impression throw-off



Feb. 16 .1926.

W. M. KELLY IMPRESSION THROW-OFF Filed April 5, 1923 2 Sheets-Sheet lFeb. 16 1926.

W. M. KELLY IMPRESSION THROW-OFF Filed April 5, 1923 2 Sheets-Sheet 2 aiw wind R 5E"? Patented Feb. 16, 1926.

, UNITED STATES 1,573,005 PATENT orFicE.

WILLIAM M. KELLY, or wEsTFInLnfN-nw JERSEY.

rlvrrnnssion Aspnc'atida filed April 5,

T 0 all to 710m it may concern. 1 Be it known that LWVILLZATM M. KELLY,

a citizen of the United States, and a resident of lVestfield, UnionCounty, New Jersey,

have invented certain new and useful improvei'nents in In'ipressionThrow-Offs, of which the following is a specification.

The present invention relates to printing presses of thebed-and-cylinder type, and consists in improved mechanism forcontrolling the impression throw-off.

In the operation of presses of the type mentioned the impression isregularly thrown on and off as the sheets are printed and delivered, bymeans of devices which raise and lower the impression cylinder once foreach sheet operated on. ltis sometimes desirable to maintain theimpression cylinder in raised position while the press is operating, aswhen no sheets are being fed, or -when-the sheet feeding mechanism failsto forward a sheet, or when asheet is presented to the impressioncylinder in a crumpled condition. Means is usually provided for manuallyrendering the cylinder raising and lowering mechanism inoperative, andalso for pre venting actuation of this manual means whenthe cylinder isdown.

The object of the present invention is to provide an improvedpositive,locking means forthe impressionthrow-off, which will pre ventabsolutely the operation of said throwoff at all times except when theimpression cylinder is in fully raised position.-

d Other objects and featuresof novelty will be apparent from thefoll'oivingdescription taken in connection with the drawings. in. which:

Figure 1 is a side view of a portion of a press showing impressionthrow-oil inecha nism including the present improvements Figure 2 is aperspective view of parts of the impression throw-off mechanismdetachedfrom the press; Q

F'gure 3 is a detail plan view illustrating the pedal and sheet detectorconnections to the rock shaft whic'lroperates the throw-oil and also theloclrin'g connection for this shaft; and

Figure 1 is a horizontal section on line 1-4: of Figure 1.

The impression: throw-off shown in the drawings is substantiallythe'same as that illustnated in my copending application Serial No.190,290, with the exception ofithe locking means; and reference may behad to THROW-err.

1923 Serial No. 630,195.

said application for a more detailed showing and description of thevarious elements of said throw-o-fl. p

lhe impression cylinder 10 is raised and lowered by means of a shaft 11and eccen tries thereon connected by means of links with verticallyslidable bearings of the im pression cylinder. The shaft 11 isoscillated to raise and lower the cylinder by means consisting ofadjustable r )ClS 12wl-1ich connect arms 13 on shaft 11 witharms 14 and15 on a shaft 16, a gab hook 17 pivoted-at one endto an arm on shaft 16and having its other end hooked over a pin 18 at the lower end of alever 18 which is fulcrumed at 19 on the frame of the press, and a cam20 engaging a laterally projecting pin on lever 18. For releasing thegab hook to render the impression throw-off inoperative, there isprovided a rock shaft 21 journaled in the frame of thepress and havingan arm 22 at one end-thereof from which projects a pin 22 adapted-toengage under the gab hook and lift the-same out of engagement with thepin on lever 18.

Means areprovided for operatin shaft 21 either manually at will orautomatically in 'resp'onse'to the sheet detector of the press. Themanual means comprises an arm 23 freely rotatable on shaft 21 and havingan extension 24 engaging the end of a screw pin adjustably mounted in alug 25 on an arm 26 which is pinned to shaft 21. The arm is swivellyconnected at its free end to the upper end-of a rod which has its lowerGlittgtlliiltitl in a hole in a bracket'ild bolted to the press frame.Rod 21" has fixed tliereto a pedal 29 and a latch 30. A coil spring 27surrounds the rod 2? between the latch and the bracket 28. WVhen thepedal is depressed agai'nft the action of the coil spring, rock shaft 21is rotated and the gab hook is released. The pedal may behelddeprersedflw turningthe rod 27 to engage the latch under a shoulderformed on bracket Latch 30 has an arm 31 adapted to engage the bracketand thus limit the opposite rotation of rod 27. The automatic means foroperating shaft 21 comprises a link 32 pivoted at itslower end to arm 26and connected'at its upperen'd to be operated under control of the sheetdetector thus rotating shaft 21 and releasing the gab hook.

The devices thus far described are 'substantially the same as thosedisclosed in my copending application. The present invention hasparticular reference to the means for locking the shaft 21 againstturning while the impression cylinder is down and releasing said shaftonly when said cylinder is in substantially fully raised position. Thismeans comprises an arm 38 pinned to shaft 21, an arm 34 rigid with arm15 but offset therefrom and a link 35 pivotally connected at one end toarm and having a longitudinal slot in its other end engaging a pinmounted in the free end of arm 32. The position of these parts shown inthe drawings is that at which the impression cylinder is down. In thisposition it will be noted that it is impossibleto rotate shaft 21 by thedepression of pedal 29 or by the upward movement of link 32. It will notbe possible to rotate said shaft sufficiently to release the gab hookuntil the impression cylinder has nearly reached its fully raisedposition, for the reason that the link 35 will not be moved sufficientlyfrom the position shownto permit movement of, the pin on arm 33 in theslot in said link to the'extent;

, required to release the gab hook, until the impression cylinder hasbeen fully raised. In the position of the parts illustrated, with thecylinder down,the crank arm 34 is near itsdead center with respectto thelink 35 so that the movement of the latter will be relatively small ascompared with the movement of the crank arm from the initial positionshown. This will prevent substantial operation of shaft 21 during theinitial raising movement of the impression cylinder, and the parts areso constructed that the shaft 21 cannot be rotated sufficiently torelease the gab hook until the impression cylinder has nearly reachedfully raised position, This locking device, therefore, provides apositive lock preventing the operation of the impression throw-offat'all times exceptwhen the cylinder is fully raised. i -Although oneembodiment of the invention has been described in detail, the inventionis not thus limited but includesmodifications and changesthat comewithin the scope of the appended claims. 7

Having thus described the invention what isclaimed as new and desired tobe secured by Letters Patent is:

1. In a printing press, in combination, an impression cylinder, meansfor raising and lowering said. cylinder in timed relation to theoperation of the press, including a shaft operativeiy connected to saidcylinder and a releasable connection between said shaft. and the pressoperating mechanism, means for releasing said connection, and means forpr venting operation of said releasing means when said cylinder is down,including a lostmotion connection between said shaft and said releasingmeans.

2. In a pr nting press, 1n combination, an

impression cylinder, means for raising and releasable connection betweensaid shaft and the press operating mechanism, means for releasing saidconnection including a rock shaft, and means for preventing operation ofsaid releasing means when said cylinder is down includinga lost-motionconnection between said shaft and said rock shaft.

3. In a printing press, in combination, an impression cylinder,n1eansfor raising and lowering said, cylinder in timed relation to theoperation of the press, including a shaft operatively connected to saidcylinder and a releasable connection between said shaft and thepress-operating mechanism, means for releasing said connection includinga rock shaft, and means for preventing operation of said rock shaft whensaid cylinder is down including a lost-motion connection be tween saidshaft and said rock shaft.

4-. In a printing press, in combination, an impression cylinder, meansfor raising and lowering said cylinder in timed relation to theoperation of the press, including a shaft operatively connected to saidcylinder and a releasableconnection between said shaft and thepress-operating mechanism, means for releasing said connection includinga rock shaft, and means for preventing operation of said rock shaft whensaid cylinder is down,

including an arm on said rock shaft, an arm on said shaft and a linkpivoted'to one of said arms and having a pin-and-slot connection withthe other of said arms 5. In a printingpress, in combination, animpression cylinder, means for raising and lowering said cylinder intimed. relation to the operation of the press, including a shaftoperatively connected to said cylinder, an arm onsaid shaft, a gab hookpivoted. to said arm, a lever having a pinengaged. by said gab hook andmeans for oscillating said lever; means for disengaging said gab hookfrom said lever, including a rock shaft operatively connected to saidgab hook and means for rotating said rock shaft to lift said gab hookout of engagement with the pin on said lever, and means for preventingrotation of said rock shaft when. said cylinder is down including alost-motion connection between said shaft and said rock shaft.

6. In a printing press, in combination, an impression cylinder, meansfor raising and lowering said cylinder in timed relation to theoperation of the press, including a shaft operatively connected to saidcylinder, an arm on said shaft, a gab hook pivoted to said arm, a leverhaving a pin engaged by said gab hook and a cam engaged by said lever;means for disengaging said gab hook from said lever, including a rockshaft, an arm on said rock shaft having a pin adapted to engage undersaid gab hook and means for rotating said rock shaft; and means'toprevent rotation of said rock shaft when said cylinder is down,including a lost-motion connection between said shaft and said rockshaft.

'7. In a printing press, in combination, an impression cylinder, meansfor raising and lowering said cylinder in timed relation to theoperation of the press, including a shaft operatively connected to saidcylinder, an arm on said shaft, a gab hookpivoted to said arm, a leverhaving a pin engaged by said gab hook and a cam for oscillating saidlever; means for disengaging said gab hook from said lever including arock shaft, an arm on said rock shaft having a pin adapted to engageunder said gab hook and means for rotating said rock shaft to lift saidgab hook out of engagement with the pin on said lever; and means forpreventing rotation of said rock shaft when said cylinder is down,including an arm on said rock shaft, an arm on said shaft and a linkpivoted to one of said arms and having pin-and-slot connection with theother of said arms. a

8. In a printing press, in combination, an impression cylinder, meansfor raising and lowering said cylinder in timed relation to theoperation of the press, including a shaft operatively connected to saidcylinder and a releasable connection between said shaft and the pressoperating mechanism, manual means for releasing said connection, meansfor releasing said connection independently of said manual means, andmeans actuated by said shaft for preventing operation of said lastmentioned ,two means when said cylinder is down.

9. In a printing press, in combination, an impression cylinder, meansfor raising and lowering said cylinder in timed relation to theoperation of the press, including a shaft operatively connected to saidcylinder and a releasable connection between said shaft and the pressoperating mechanism, a rock shaft having means to actuate saidreleasable connection, two arms on said rock shaft one of which is fixedthereon and the other of which has a one way connection with said rockshaft, manual means for operating one of said arms and independent meansfor operating the other arm, and means actuated by said shaft forpreventing operation of said rock shaft when said cylinder is down.

10. In printing press, in combination, an impression cylinder, means forraising and lowering said cylinder in timed relation to the operation ofthe press, including a shaft ope 'atively connected to said cylinder anda releasable connection between said shaft and the press operatinmechanism, means for releasing sa d connections including a rock shafthaving an arm engaging said connection, a second arm fixed to said rockshaft, a rod having its upper end swiveled iniiaid second arm and havingits lower end guided in the frame of the press, a pedal mounted on saidrod and a coil spring. surrounding said rod and normally holding saidrock shaft in non-releasing position with respect to said releasableconnections, and means for preventing operation of said rOckQshaft whensaid cylinder is down including an arm fixed tov said re'ckshaft, an armfixed-to said shaft and a link pivoted .to one arm, and having alost-motion connection with the other arm.

11. In a printing press, in combination, an impression cylinder, meansfor raising and lowering said cylinder in timed relation tothe'operation of the press including a shaft operatively connected tosaid cylinder and a releasable operating connection between said shaftand the press operation mechanism, means for releasing said connectionincluding a rock shaft having an arm adapted to operate said connection,a second arm fixed to said rock shaft, a link connecting said second armto the sheet detector mechanism of the press, a third arm revolublymounted on said rock shaft and having an extension adapted to engageunder a lug on said second arm, and a pedal operatively connected tosaid third arm, and means preventing operation of said rock shaft exceptwhen said cylinder is in fully raised position, including an arm on saidshaft, a link pivoted to said arm, a fourth arm fixed on said rock shafthaving a pin and slot connection with said link.

i 12. In a printing press, in combination, an impression cylinder, meansfor raising and lowering said cylinder in timed relation to theoperation of the press, including a shaft operatively connected to saidcylinder, an arm on said shaft, a link pivoted at one end to said armand having a downwardly open-" ing slot formed adjacent to its otherend, a depending lever fulcrumed in the frame of the press and having alaterally extending pin adjacent its lower end engaged in said slot anda cam rotated by the operating mechanism of the press engaging saidlever, means for raising said link to disengage said pin, including arock shaft journaled in the frame of the press having an arm at one endand a pin projecting laterally there from adapted to engage the underside of 1 said link, a second arm fixed to said rock shaft, a linkconnecting said second arm to the sheet-detector mechanism of the press,a third arm revolubly mounted on said rock shaft and having an extensionadapted to engage under a lag 011 said second arm and a pedaloperatively connectedto said third arm, and means preventingdisengagement of said pin and slot except when said cylinder is inraised position, including a second arm on said shaft',a link pivoted tosaid second arm and a fourth arm fixed-on said rock shaft and having pinand slot connection with said link, said last mentioned arms and linkbeing so arranged that when the cylinder is down the pin engages theouter end of the slot and the second arm on said shaft is substantiallyparallel with the link.

13. In a printing press, in combination, an impression cylinder, meansfor raising and lowering said cylinder in timed relation to theoperation of the press, includinga shaft operatively connected tosaid-cylinder and a releasable .connection between said shaft and thepress operating meehanisn'i, 20

means forreleasing said connection including a rock shaft, and meanspreventing release of said connect-ion except when said cylinder is infully raised position, including an arm on said shaft, a link pivoted atone ,endto said arm and having a longitudinal slot adjacent its otherend, an arm fixed on said rock shaft having pin engaging said slot, saidarms and link being so arranged that when said cylinder is down the pinis at the outer end of the slot and the arm on said shaft issubstantially parallel with the link.

In testimony whereof I hereunto aflix my si gnatnre.

' VILLIAM M. KELLY.

